audio-utils/test/test_audio_utils.js

Audio utilities like fundamental frequency detection, populate buffer with sinusoidal curves

#!/usr/bin/env node 

// ---

// var audio_util_obj = require("../src/audio_utils");
// var audio_utils = audio_util_obj.audio_utils();

var audio_utils = require("../src/audio_utils");
console.log("audio_utils ", audio_utils);

// ---

var path = require('path');

function resolvePath(str) {
  if (str.substr(0, 2) === '~/') {
    str = (process.env.HOME || process.env.HOMEPATH || process.env.HOMEDIR || process.cwd()) + str.substr(1);
  }
  return path.resolve(str);
}

// ---

var shared_utils = require("shared-utils");

// ------------------------------------- //

var cb_read_file_done = function(audio_obj) {

    console.log("cb_read_file_done ");
    console.log("cb_read_file_done ");
    console.log("cb_read_file_done ");
    console.log("cb_read_file_done ");

    shared_utils.show_object(audio_obj, 
        "backHome audio_obj 32 bit signed float   read_file_done", "total", 0);
};

// ---

var cb_write_file_done = function(audio_obj, cb_post_write) {

    console.log("cb_write_file_done ");
    console.log("cb_write_file_done ");
    console.log("cb_write_file_done ");


    shared_utils.show_object(audio_obj, 
        "backHome audio_obj 32 bit signed float    write_file_done ", "total", 10);
};

// ------------------------------------------------------------------------------------ //

var synth_curve_write_to_wav_file_then_read_back = function () {

    // ---------- generates sin tone ------------- //

    var local_output_dir = process.env.AUDIO_DIR || process.env.HOME;

    var output_dir = resolvePath(local_output_dir);

    var output_format = ".wav";

    console.log(" output_dir ", output_dir);

    // ----------------

    var SIZE_BUFFER_SOURCE = 256;
    // SIZE_BUFFER_SOURCE = 16384;

    var samples_per_cycle = 64;

    var source_obj = {};

    var source_obj = audio_utils.pop_audio_buffer(SIZE_BUFFER_SOURCE, samples_per_cycle);

    var max_index = 3;
    // var max_index = SIZE_BUFFER_SOURCE;

    for (var index = 0; index < max_index; index++) {

        console.log(index, " pop_audio_buffer ", source_obj.buffer[index]);
    }

    // ---------- write to output file ------------- //

    var source_wave = "audio_util_test_file";

    var source_wave_filename = path.join(output_dir, source_wave + output_format);

    console.log("source_wave_filename   ", source_wave_filename);

    // shared_utils.write_32_bit_float_buffer_to_16_bit_wav_file(source_obj, source_wave_filename);

	shared_utils.write_32_bit_float_buffer_to_16_bit_wav_file(source_obj, source_wave_filename);


// var read_wav_file = function(input_filename, cb_read_file_done) {



    console.log("source_wave_filename   ", source_wave_filename);

    // ------------ read wav file -------------------- //

    console.log("\n\nread wav file\n\n");

    var wav_file_input_obj = {};  // create stub object to which we attach .buffer

    var property_buffer_raw_input_file = "buffer_raw_input_file";
    var property_buffer_input_file     = "buffer_input_file";

    wav_file_input_obj.filename = source_wave_filename;

    // wav_file_input_obj[property_buffer_raw_input_file] = new Buffer(0); // gives (node:429147) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

    wav_file_input_obj[property_buffer_raw_input_file] = new Buffer.alloc(0);

    console.log("abouttttt to read wav_file_input_obj.filename ", wav_file_input_obj.filename);

    var spec = {};

/*
    shared_utils.read_16_bit_wav_file_into_32_bit_float_buffer(
                                    wav_file_input_obj,
                                    wav_file_input_obj.filename, 
                                    spec,
                                    cb_read_file_done);
*/

	shared_utils.read_wav_file(wav_file_input_obj.filename, cb_read_file_done);



};      //      synth_curve_write_to_wav_file_then_read_back

synth_curve_write_to_wav_file_then_read_back();


console.log("<><><>  <><><>  <><><>   end of processing   <><><>  <><><>  <><><>");